a construction worker operates a jackhammer that pounds continuously into concrete pavement. Sweat drips from his face as he maintains his grip on the vibrating tool that never stops moving. The concrete below shows progressive cracking and breaking from the constant pounding motion. Dust and small debris fly continuously from the impact point as the work progresses without pause. Other workers nearby cover their ears from the non-stop noise while trucks and equipment operate simultaneously in the background. work that never stops or slackens in intensity